Methods and apparatus for removal and control of material in laser drilling of a borehole
US-9512679-B2 · Dec 6, 2016 · US
Rock drilling in great depths by thermal fragmentation using highly exothermic reactions evolving in the environment of a water-based drilling fluid
US8967293B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8967293-B2 |
| Application number | US-200913141349-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 22, 2009 |
| Priority date | Dec 23, 2008 |
| Publication date | Mar 3, 2015 |
| Grant date | Mar 3, 2015 |
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Abstract
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A method and a device to thermally fragment rock for excavation of vertical and directional boreholes in rock formations, preferentially hard rock, using highly exothermic reactions. Exothermic reactions are initiated directly in the pressurized, aqueous environment of a water-based drilling fluid preferably above the critical pressure of water (221 bar). After reaction onset temperatures within the reaction zone exceed the critical temperature for water (374° C.) providing supercritical conditions, which favor the stabilization of the reaction, e.g. a supercritical hydrothermal flame. Since reactions can be run directly in a water-based drilling fluid, the method proposed here allows high density drilling action as in conventional rotary drilling. A part from the hot reaction zone of the proposed reaction can be brought directly to the rock surface in case of hard polycrystalline rock, where high temperatures are required.
First claim
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The invention claimed is: 1. A method of thermal rock fragmentation in a borehole by an exothermic chemical reaction of at least two reactants in the presence of a water-based drilling fluid having a pressure of more than 1.5 bar, the method comprising the steps of: feeding the water-based drilling fluid to a downhole assembly in a borehole and ejecting said drilling fluid from the downhole assembly into the borehole; feeding the reactants for said exothermic reaction via feedin…
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- E21B7/14Primary
Fixed Constructions · mapped topic
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- What does patent US8967293B2 cover?
- A method and a device to thermally fragment rock for excavation of vertical and directional boreholes in rock formations, preferentially hard rock, using highly exothermic reactions. Exothermic reactions are initiated directly in the pressurized, aqueous environment of a water-based drilling fluid preferably above the critical pressure of water (221 bar). After reaction onset temperatures withi…
- Who is the assignee on this patent?
- Von Rohr Philipp Rudolf, Rothenfluh Tobias, Schuler Martin, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification E21B7/14. Mapped technology areas include Fixed Constructions.
- When was this patent published?
- Publication date Tue Mar 03 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).